rubyPackages: remove global v8 pinning

Removes global pinning of v8 to 3.16.14 and also removes the
unreferenced package 'therubyracer'.

pkgs/development/ruby-modules/gem-config/default.nix

@@ -18,7 +18,7 @@
 # (to make gems behave if necessary).
 
 { lib, fetchurl, writeScript, ruby, kerberos, libxml2, libxslt, python, stdenv, which
-, libiconv, postgresql, v8_3_16_14, clang, sqlite, zlib, imagemagick
+, libiconv, postgresql, v8, clang, sqlite, zlib, imagemagick
 , pkgconfig , ncurses, xapian, gpgme, utillinux, tzdata, icu, libffi
 , cmake, libssh2, openssl, libmysqlclient, darwin, git, perl, pcre, gecode_3, curl
 , msgpack, qt59, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, buildRubyGem
@@ -29,8 +29,6 @@
 }@args:
 
 let
-  v8 = v8_3_16_14;
-
   rainbow_rake = buildRubyGem {
     pname = "rake";
     gemName = "rake";
@@ -567,14 +565,6 @@ in
     buildInputs = [ freetds ];
   };
 
-  therubyracer = attrs: {
-    buildFlags = [
-      "--with-v8-dir=${v8}"
-      "--with-v8-include=${v8}/include"
-      "--with-v8-lib=${v8}/lib"
-    ];
-  };
-
   typhoeus = attrs: {
     buildInputs = [ curl ];
   };

pkgs/development/ruby-modules/with-packages/Gemfile

@@ -144,7 +144,6 @@ source 'https://rubygems.org' do
   gem 'snappy'
   gem 'sqlite3'
   gem 'taglib-ruby'
-  gem 'therubyracer'
   gem 'thrift'
   gem 'tilt'
   gem 'tiny_tds'